الفهرس 
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Abstract
This study aimed to examine the weight loss caused by a corrosive medium and the impact of corrosion on the flexural strength and micro hardness of lithium disilicate glass ceramic and high transparent monolithic zirconia.
A total of forty samples were fabricated and categorized into two groups based on the type of ceramic materials employed: group 1 (E max) and group 2 (High Translucent Zirconia (DD BioZx2)). Each group consisted of twenty samples.
Subsequently, each group was separated into two subgroups, with each subgroup consisting of 10 samples, based on their exposure to corrosive media. Subsequently, five samples from each subgroup were exposed to various assays employed in the study.
The samples within the corrosion subgroups were initially measured for weight, thereafter exposed to a corrosion test, and then re-weighed to ascertain the amount of weight loss for each individual sample. Subsequently, five samples were selected and subjected to an initial bi-axial flexural strength test, followed by a subsequent micro hardness test.
The corroded samples were compared to the non-corroded samples that underwent the same tests in order to assess the impact of corrosive agents on the flexural strength and micro hardness of the ceramic samples being examined.
The data was collected, calculated, tabulated, and statistically examined.
The mean differences over time were compared using a Two-way Repeated Measure ANOVA, followed by a Post hoc test.
The threshold for statistical significance was established at a p-value of 0.05 or less. The statistical analysis was conducted using IBM® SPSS® Statistics Version 20 for Windows.
Corrosion test results indicated a statistically significant difference between the (E-Max) and (monolithic zirconia) materials, with a p-value of 0.0286, both before and after the test.
Biaxial flexural strength: There was no statistically significant difference in the E max group when comparing before and after corrosion within the same group (p=0.862). However, a statistically significant difference was observed when comparing the levels before and after corrosion in the monolithic zirconia group, with a p-value of 0.038. The highest mean value was found after corrosion.
Micro-hardness test results showed a statistically significant difference between the ”Before” and ”After” groups in terms of e max, with a p-value of 0.027. The maximum average value was seen in the (Before) condition, whilst the minimum average value was observed in the (After) condition.
Within the monolithic zirconia group, there was no statistically significant difference observed between the ”Before” and ”After” measurements, with a p-value of 0.075.